1. In a large saute pan over medium heat, heat 3 tablespoons olive oil until shimmering. Add bread cubes and sprinkle with salt; cook, tossing frequently, until golden brown, 5 to 10 minutes. You may need to add more oil.

2. In a large salad bowl, toss the cucumber, peppers, tomatoes and red onion.

3. For the vinaigrette, whisk the garlic, oregano, mustard, vinegar, salt and pepper. Whisk in olive oil to make an emulsion.